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arXiv 2408.07403quant-ph
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通过选择性测量从相干态生成Fock态叠加

Generating Fock-state superpositions from coherent states by selective measurement

Chen-yi Zhang, Jun Jing

AI总结:

本文提出一种无需精心驱动、仅通过谐振器与辅助量子比特的Jaynes-Cummings耦合演化及选择性投影测量,即可从相干态高效生成高保真Fock态及其叠加态和Bell类态的量子测量协议。

摘要:

Fock态及其叠加态是非经典物理的奇异试验平台,也是量子技术的宝贵资源。我们提供了一个简单的量子测量协议,用于从目标谐振器的相干态生成任意Fock态和某些叠加Fock态,而无需任何精心设计的驱动。该条件协议可以通过谐振器与辅助量子比特的联合自由演化序列以及量子比特上的投影测量来高效构建,其中谐振器与辅助量子比特通过Jaynes-Cummings相互作用耦合。通过适当选择每个演化-测量循环的持续时间和谐振器的初始态,我们可以生成所需的Fock态$|n\rangle$和叠加Fock态$(|0\rangle+|n\rangle)/\sqrt{2}$,其中$n\sim10$,在少于$30$次测量的情况下保真度超过$99\\%$。此外,我们的协议可以直接扩展到在双谐振器系统中生成具有多重激发的Bell类态$(|00\rangle+|nn\rangle)/\sqrt{2}$。我们还计算了在存在退相干的情况下我们协议的结果保真度和成功概率。

英文摘要:

Fock states and their superpositions are exotic testbeds for nonclassical physics and valuable resources for quantum technologies. We provide a simple protocol for the quantum measurement to generate an arbitrary Fock state and certain superposed Fock states from a coherent state of a target resonator, without any carefully tailored driving. This conditional protocol can be efficiently constructed by a sequence of joint free evolution of the resonator and an ancillary qubit, which are coupled via a Jaynes-Cummings interaction, and projective measurements on the qubit. By properly choosing the duration of each evolution-measurement cycle and the initial state of the resonator, we can generate a desired Fock state $|n\rangle$ and a superposed Fock state $(|0\rangle+|n\rangle)/\sqrt{2}$, $n\sim10$, with a fidelity over $99\%$ in less than $30$ measurements. Moreover, our protocol can be extended straightforwardly to the generation of a Bell-like state $(|00\rangle+|nn\rangle)/\sqrt{2}$ with multiple excitations in a double-resonator system. We also calculate the outcome fidelity and the success probability of our protocol in the presence of decoherence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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